54,932 research outputs found
A review of personal communications services
This article can be accessed from the link below - Copyright @ 2009 Nova Science Publishers, LtdPCS is an acronym for Personal Communications Service. PCS has two layers of
meaning. At the low layer, from the technical perspective, PCS is a 2G mobile
communication technology operating at the 1900 MHz frequency range. At the upper
layer, PCS is often used as an umbrella term that includes various wireless access and
personal mobility services with the ultimate goal of enabling users to freely communicate
with anyone at anytime and anywhere according to their demand. Ubiquitous PCS can be implemented by integrating the wireless and wireline systems on the basis of intelligent network (IN), which provides network functions of terminal and personal mobility. In this chapter, we focus on various aspects of PCS except location management. First we describe the motivation and technological evolution for personal communications. Then we introduce three key issues related to PCS: spectrum allocation, mobility, and standardization efforts. Since PCS involves several different communication
technologies, we introduce its heterogeneous and distributed system architecture. IN is
also described in detail because it plays a critical role in the development of PCS. Finally, we introduce the application of PCS and its deployment status since the mid-term of 1990’s.This work was supported in part by the National Natural Science Foundation of China
under Grant No. 60673159 and 70671020; the National High-Tech Research and Development Plan of China under Grant No. 2006AA01Z214, and the Engineering and Physical Sciences Research Council (EPSRC) of UK under Grant EP/E060722/1
Synchronous Online Philosophy Courses: An Experiment in Progress
There are two main ways to teach a course online: synchronously or asynchronously. In an asynchronous course, students can log on at their convenience and do the course work. In a synchronous course, there is a requirement that all students be online at specific times, to allow for a shared course environment. In this article, the author discusses the strengths and weaknesses of synchronous online learning for the teaching of undergraduate philosophy courses. The author discusses specific strategies and technologies he uses in the teaching of online philosophy courses. In particular, the author discusses how he uses videoconferencing to create a classroom-like environment in an online class
Tracking Chart 2006 Nordstrom, China 080215438E
FLA_2006_Nordstrom_TC_China_080215438E.pdf: 13 downloads, before Oct. 1, 2020
Numerical analysis of a fin-tube plate heat exchanger with winglets
In this presented work, numerical analysis of heat transfer and flow characteristic using
longitudinal vortex generators (LVGS) in fin and flat tube heat exchanger has been
presented. Conjugate heat transfer 3D numerical model has been developed and
successfully carried out. Rectangular winglets were set in pairs, with downstream
orientation. The effects of impact angles of (20⁰ , 30⁰, and 40⁰ ) as well as tubes and
winglets were placed in one row lined arrangement and air flow by forward
arrangement and backward arrangement. Reynolds number is ranged from 500 to 5000.
The numerical results showed that in the range of the present study, the variation of
these parameters can result in the increase of heat transfer. The study focuses on the
Influence of the different parameters of VGs on heat transfer and fluid flow
characteristics of one row lined circular-tube banks. The characteristics of average Nu
number and skin friction coefficient are studied numerically by the aid of the
computational fluid dynamics (CFD) commercial code of FLUENT ANSYS 14. The
results showed increasing in the heat transfer and skin friction coefficient with the
increasing of Re number. It has been observed that the overall Nuav number of one
circular tubes increases by 23-31% ,by 23-43% and by 23-47% with angles of (20⁰,
30°, and 40⁰) respectively, in forward arrangement and the overall Nuav number of one
circular tubes increases by 23-42%, by 23-46% and 23-52%with angles of (20⁰, 30°,
and 40⁰) respectively, in backward arrangement, with increasing in the overall average
of skin friction coefficient. Also the results showed that the rectangular winglet pairs
(RWPs) can significantly improve the heat transfer performance of the fin and-tube
heat exchangers with a moderate pressure loss penalty
Discussion of: A statistical analysis of multiple temperature proxies: Are reconstructions of surface temperatures over the last 1000 years reliable?
Discussion of "A statistical analysis of multiple temperature proxies: Are
reconstructions of surface temperatures over the last 1000 years reliable?" by
B.B. McShane and A.J. Wyner [arXiv:1104.4002]Comment: Published in at http://dx.doi.org/10.1214/10-AOAS398J the Annals of
Applied Statistics (http://www.imstat.org/aoas/) by the Institute of
Mathematical Statistics (http://www.imstat.org
Tracking Chart 2005 Adidas Group, Indonesia 01023369D
This document is part of a digital collection provided by the Martin P. Catherwood Library, ILR School, Cornell University, pertaining to the effects of globalization on the workplace worldwide. Special emphasis is placed on labor rights, working conditions, labor market changes, and union organizing.FLA_2005_AdidasGroup_TC_Indonesia_01023369D.pdf: 45 downloads, before Oct. 1, 2020
Tracking Chart 2005 Nike, Indonesia 01023369D
This document is part of a digital collection provided by the Martin P. Catherwood Library, ILR School, Cornell University, pertaining to the effects of globalization on the workplace worldwide. Special emphasis is placed on labor rights, working conditions, labor market changes, and union organizing.FLA_2005_Nike_TC_Indonesia_01023369D.pdf: 15 downloads, before Oct. 1, 2020
Tracking Chart 2006 Nike, Sri Lanka 010270355E
This document is part of a digital collection provided by the Martin P. Catherwood Library, ILR School, Cornell University, pertaining to the effects of globalization on the workplace worldwide. Special emphasis is placed on labor rights, working conditions, labor market changes, and union organizing.FLA_2006_Nike_TC_Sri_Lanka_010270355E.pdf: 17 downloads, before Oct. 1, 2020
Tracking Chart 2006 Adidas Group, Sri Lanka 010270355E
This document is part of a digital collection provided by the Martin P. Catherwood Library, ILR School, Cornell University, pertaining to the effects of globalization on the workplace worldwide. Special emphasis is placed on labor rights, working conditions, labor market changes, and union organizing.FLA_2006_AdidasGroup_TC_Sri_Lanka_010270355E.pdf: 26 downloads, before Oct. 1, 2020
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